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From 1984 through 1987 he served as the Head Junior National Coach with the USA Junior National Team that included Pete Sampras, Jim Courier, Michael Chang, Patrick McEnroe, Luke Jensen, David Wheaton and MaliVai Washington.
Blackman beat future Grand Slam winners Michael Chang and Petr Korda en route to the semi-finals of the 1986 US Open Juniors and was also a semi-finalist at the same event a year later, with MaliVai Washington in the doubles.